The new eyewear company Shauns is offering handmade sunglasses with a humanitarian bent. For every pair sold, the founder and creative director, Shaun Paterson—who was inspired to start the brand after his vision began deteriorating at the age of 15—donates a pair of eyeglasses and sponsors an eye exam for someone in need in a developing country. The Del Mar, Calif.–based company has created sleek, aviator-shaped acetate and stainless steel frames that are made by artisans in a small, third-generation family-o…